> ## Documentation Index
> Fetch the complete documentation index at: https://www.narev.ai/docs/llms.txt
> Use this file to discover all available pages before exploring further.

# Getting started

> First steps with Fireworks middleware for tracking AI costs.

## Installation

```bash npm theme={null}
npm install @ai-billing/fireworks @ai-billing/core @ai-sdk/fireworks ai
```

```bash pnpm theme={null}
pnpm add @ai-billing/fireworks @ai-billing/core @ai-sdk/fireworks ai
```

```bash yarn theme={null}
yarn add @ai-billing/fireworks @ai-billing/core @ai-sdk/fireworks ai
```

## Overview

The `@ai-billing/fireworks` package provides middleware for tracking token usage and calculating costs when using Fireworks models with the Vercel AI SDK.

It captures Fireworks' OpenAI-compatible usage payload, including cached prompt tokens and reasoning tokens, ensuring that costs are accurately reflected.

## Usage

To use the middleware, wrap your Fireworks model using `wrapLanguageModel` from the `ai` package and pass the `createFireworksMiddleware`.

**1. Initialize the Fireworks provider**

First, set up the provider using the Fireworks SDK and your API key.

```typescript theme={null}
import { createFireworks } from '@ai-sdk/fireworks';

const fireworks = createFireworks({
  apiKey: process.env.FIREWORKS_API_KEY,
});
```

**2. Define model pricing**

Set up a price resolver to define the costs for the models you'll be using. Fireworks bills on
prompt tokens, completion tokens, and cached prompt tokens (`inputCacheReadTokens`).

Fireworks has no separate pricing tier for reasoning tokens — reasoning tokens are billed at the
same rate as `completionTokens`, so you don't need to configure anything extra for reasoning
models.

```typescript theme={null}
import { createObjectPriceResolver } from '@ai-billing/core';

const priceResolver = createObjectPriceResolver({
  'accounts/fireworks/models/glm-5p3-flash': {
    promptTokens: 0.0000002, // 0.2 per 1M tokens
    completionTokens: 0.0000008, // 0.8 per 1M tokens
    inputCacheReadTokens: 0.0000001, // 0.1 per 1M tokens
  },
});
```

**3. Create the billing middleware**

Initialize the Fireworks billing middleware. You need to provide a destination (such as `consoleDestination`) where billing events will be sent, along with your `priceResolver`.

```typescript theme={null}
import { createFireworksMiddleware } from '@ai-billing/fireworks';
import { consoleDestination } from '@ai-billing/core';

const billingMiddleware = createFireworksMiddleware({
  destinations: [consoleDestination()],
  priceResolver: priceResolver,
});
```

**4. Wrap the model**

Use `wrapLanguageModel` from the `ai` package to apply the billing middleware to your Fireworks model.

```typescript theme={null}
import { wrapLanguageModel } from 'ai';

const wrappedModel = wrapLanguageModel({
  model: fireworks('accounts/fireworks/models/glm-5p3-flash'),
  middleware: billingMiddleware,
});
```

**5. Use the wrapped model**

Finally, use the wrapped model with AI SDK functions like `generateText` or `streamText`. The billing middleware will automatically track tokens, handle reasoning metrics, and calculate costs.

```typescript theme={null}
import { generateText } from 'ai';

const result = await generateText({
  model: wrappedModel,
  prompt: 'What is the capital of Sweden?',
});
```


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